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The encode of 2 dimension bar code, generate
From;    Author:Stand originally

[summary]Common one dimension bar code applies branch of industry, commerce, national defence, traffic extensively already to carry, the domain such as sanitation of finance, medical treatment, post and telecommunications and office automation, but one dimension bar code has very big drawback in a lot of respects. 2 dimension bar code remedied these flaw, but the development existing state of affairs of technologies of 2 dimension bar code is more backward, technology of 2 dimension bar code remains to develop further.
The article introduced basic bar code knowledge, and a few data compress the algorithm with desired result, elaborated the relevant concept of 2 dimension bar code and encode process, and. The process designing that article key is coding at 2 dimension bar code comes true. In numerous structured language, the article chose Object Pascal language, process designing undertakes below environment of Delphi 6.0 development. To more classical in process of process designing of 2 dimension bar code algorithm, introduce relatively in detail in the article, show its encode method with source program.
[keyword] 2 dimension bar code, PDF417, compress mode, whole world to label identifier, number compresses code of mode, desired result

1. Foreword
Common one dimension bar code from this century 70 time initial stage comes out since, got very quickly popular and apply branch of industry, commerce, national defence, traffic extensively to carry, the domain such as sanitation of finance, medical treatment, post and telecommunications and office automation. But one dimension bar code can represent data in one dimension direction only, data capacity is accordingly small, and keep secret gender, dependability is inferior.
As a result of the limitation of one dimension bar code, pressing hope invents people a kind of new bar code, outside eliminating the advantage that has common bar code, have data capacity at the same time big, dependability is tall, confidential the sex that prevent bogus is strong, make easily, cost is low advantage. Emerge as the times require of 2 dimension bar code, as a result of its advantage, its will be in before long replace one dimension bar code in the future, receive wide application. PDF417 bar code is the effort of American Symbol company through a few years, at the 2 dimension bar code that rolls out formally 1991, meaning namely " portable data file (Portable Data File) " .
At the same time we also want to see, the development existing state of affairs of the 2 dimension bar code of our country is more backward, the application that technology of 2 dimension bar code is in our country is almost blank. And be in home, the document that discusses the encode of 2 dimension bar code, technique that read a code, website, book is less, 2 dimension bar code is relevant equipment (if read a code implement) output is inferior. Nevertheless the application of 2 dimension bar code is the inevitable trend of development, of 2 dimension bar code gain ground, also hopeful comes true inside a few years. Accordingly, in home, it is certain to study the task still is had originally before look up sex.
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